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LG CF-14 Service Manual

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P/NO : 3828VD0104T
Jan.,2002
Printed in Korea
COLOR TV

SERVICE MANUAL

CHASSIS : MC-019A
MODEL : CF-14/20/21D70K CF-14D10K
MODEL :
CF-20F60K CF-21F30K
MODEL :
CF-20/21S31KE/KEX
MODEL :
CF/CT-14/20/21K50KE/53KE
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html

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  Summary of Contents for LG CF-14

  • Page 1: Service Manual

    COLOR TV SERVICE MANUAL CHASSIS : MC-019A MODEL : CF-14/20/21D70K CF-14D10K MODEL : CF-20F60K CF-21F30K MODEL : CF-20/21S31KE/KEX MODEL : CF/CT-14/20/21K50KE/53KE CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Jan.,2002 P/NO : 3828VD0104T Printed in Korea...
  • Page 2: Table Of Contents

    CONTENTS Contents ......................... 2 Safety Precautions ....................3 Servicing Precautions ..................4 Specifications ..................... 6 Description of Controls .................. 7 Disassembly Instructions ................10 Adjustment ......................11 Purity & Convergence Adjustment ............14 Block Diagram ......................17 Exploded View ....................18 Exploded View Parts List ................19 Replacement Parts List ................
  • Page 3: Safety Precautions

    SAFETY PRECAUTIONS IMPORT ANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by the Schematic Diagram and Replacement Parts List. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
  • Page 4: Servicing Precautions

    SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service transistors and semicounductor "chip" components. The manual and its supplements and addenda, read and follow the following techniques should be used to help reduce the SAFETY PRECAUTIONS on page 3 of this publication. incidence of component damage caused by static by static NOTE: If unforeseen circumstances create conflict between the electricity.
  • Page 5 c. Qulckly move the soldering iron tip to the junction of the Fuse and Conventional Resistor component lead and the printed circuit foil, and hold it Removal/Replacement there only until the solder flows onto and around both the 1. Clip each fuse or resistor lead at top of the circuit board component lead and the foil.
  • Page 6: Specifications

    SPECIFICA TIONS Note : Specification and others are subject to change without notice for improvement. Video input system: PAL-B/G, D/K, I/I SOUND IF : 33.4MHz (B/G) SECAM-B/G, D/K,L/L’ 32.9MHz (I/I) NTSC M 32.4MHz (D/K) NTSC 4.43 34.4MHz (M) Intermediate Frequency (Unit : MHz) Power requirement : 110~240V, 50/60Hz VISION IF : 38.9MHz COLOR IF : 34.47MHz(4.43)
  • Page 7: Description Of Controls

    DECRIPTIONS OF CONTROLS All the functions can be controlled with the remote control handset. Some functions can also be adjusted with the buttons on the front panel of the set. Remote control handset Before you use the remote control handset, please install the bat- teries.
  • Page 8: Battery Installation

    10. MUTE switches the sound on or off. 11. TV/AV selects TV or AV mode. clears the menu from the screen. switches the set on from standby. 12. I/II/ (option) selects the language during dual language broadcast. (option) selects the sound output. POWER MUTE 13.
  • Page 9: Front Panel

    Front panel Shown is a simplified representation of front or side panel. Here shown may be somewhat different from your set. VIDEO VIDEO ON/OFF MENU OK VIDEO (L)-AUDIO-(R) P-TURBO-S AUDIO AUDIO 2 3 4 TURBO ON/OFF MENU OK VIDEO AUDIO SOUND PICTURE VIDEO VIDEO...
  • Page 10: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS Important note Chassis Assy Removal This set is disconnected from the power supply through the Grasp both side of Frame and pull it backward smoothly. converter transformer. An isolating transformer is necessary for service operations on the primary side of the converter transformer.
  • Page 11: Adjustment

    ADJUSTMENT Safety Precautions Option Code Function Remark 1. It is safe to adjust after using insulating transformer W/O TBS between the power supply line and chassis input to WITH TBS prevent the risk of electric shock and protect the instrument. W/O EYE 2.
  • Page 12: Screen Voltage Adjustment

    Table below. 5) Press the OK( ) button to memorize the data. Status Initial Data Remark 6700VPF009G Tuner P/N 6700VPF016A LG Innotek(W/S TUNER) Marker DAEWOO(W/S TUNER) 2.7! 0.05V 2.7! 0.05V AGC Voltage 6700VPF009S Tuner P/N BLO-R...
  • Page 13 2. Deflection Initial Setup Data Status Default 21" FLAT S/S 21" FLAT LG 3. Deflection Adjustment Procedure VL (Vertical Linearity) Adjust so that the boundary line between upper and lower half is in accord with geometric horizontal center of the CPT.
  • Page 14: Purity & Convergence Adjustment

    PURITY & CONVERGENCE ADJUSTMENT Caution: 5. Reconnect the internal degaussing coil. Convergence and Purity have been factory aligned. Do not attempt to tamper with these alignments. 6. Position the beam bender locking rings at the 9 o'clock However, the effects of adjacent receiver components, or position and the other three pairs of tabs (2,4 and 6 pole replacement of picture tube or deflection yoke may require the magnets) at the 12 o'clock position.
  • Page 15 1.ADJUST YOKE Z-AXIS FIRST 2 .ADJUST BEAM BENDER 2 POLE TO GET EQUAL BLUE MAGNET TO GET FOUR EQUAL COLOR CIRCLES COLOR CIRCLES MAGNETS 8. Referring to above, perform the following two steps: 6. Reconnect the internal degaussing coil and apply AC power. a.
  • Page 16 ROTATION DIRECTION RING MOVEMENT OF RED OF BOTH TABS PAIRS AND BLUE BEAMS OPPOSITE POLE SAME OPPOSITE POLE SAME UP/DOWN ROCKING OF THE YOKE LEFT/RIGHT ROCKING OF THE YOKE UP/DOWN ROCKING OF THE YOKE LEET/RIGHT ROCKING OF THE YOKE CAUSES OPPOSITE ROTATION OF RED CAUSES OPPOSITE SIZE CHANGE OF THE CAUSES OPPOSITE ROTATION OF RED CAUSES OPPOSITE SIZE CHANGE OF...
  • Page 17: Block Diagram

    BLOCK DIAGRAM - 17 -...
  • Page 18: Exploded View

    EXPLODED VIEW : 14/20/21D70K - 18 -...
  • Page 19: Exploded View Parts List

    The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. PART NO LOCA. NO DESCRIPTIONS 14” 20” 21” 343-B52A 343-B52A SUPPORTER,PCB 2055-00744N 2426GCA40CP 2426VSD0019 CPT SET 6400VA0001B 6400VA0021B 6400VA0021B SPEAKER,GENERAL 150-D02W 150-D02Y 150-D02X COIL,DEGAUSSING 153-113V...
  • Page 20 EXPLODED VIEW : 14D10K - 20 -...
  • Page 21 The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTIONS 2055-00744N CPT SET A34KPU02XX 00T7ND 2055-00744K CPT SET A34KPU02XX 00L7ND 6400VA0001B SPEAKER,GENERAL 16 OHM 2.5/5W 84DB 150-D02W COIL,DEGAUSSING CU 14”...
  • Page 22 EXPLODED VIEW : 20F60K - 22 -...
  • Page 23 The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTIONS 343-B52A SUPPORTER,PCB 2426VDC0008 CPT SET 2055-01221H A48QAD220X 03T7ND 6400VA0019D SPEAKER,FULLRANGE H905/020801B 8OHM 7/1 150-D02Y COIL,DEGAUSSING CU 20” 60TURN 15 OHM 170-A01D LEAD SET,CPT EARTH 6410VEH001B...
  • Page 24 EXPLODED VIEW : 14/20/21K50KE/53KE - 24 -...
  • Page 25 The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. PART NO DESCRIPTIONS LOCA. NO 14” 20” 21” 343-B52A 343-B52A 343-B52A SUPPORTER,PCB 2055-00744N 2426GCA40CP 2426VSD0019 CPT SET 2055-00744M 2055-01221M 2055-00673T CPT SET *CASA 6400VA0019D 120-C77G 120-C77G...
  • Page 26 EXPLODED VIEW : 21F30K - 26 -...
  • Page 27 The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTIONS 343-B52A SUPPORTER,PCB 2426VSD0019 CPT SET A51QAE320X000TIB 6400VA0019D SPEAKER,FULLRANGE H905/020801B 8OHM 150-D02X COIL,DEGAUSSING CU 21” 60TURN 12 OHM 153-110F DY,DCAN1-21FSAA 170-A01D...
  • Page 28 EXPLODED VIEW : 14/20/21S31KEX - 28 -...
  • Page 29 The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. PART NO LOCA. NO DESCRIPTIONS 14” 20” 21” 2055-00744N 2426GCA40CP 2426VSD0019 CPT SET 6400VA0020D 120-C77G 120-C77G SPEAKER,FULLRANGE 6400VG0002A 6400VG0002A SPEAKER,TWEETER 150-D02B 150-D02Y 150-D02N COIL,DEGAUSSING 153-113V...
  • Page 30: Replacement Parts List

    The components identified by mark critical for safety. REPLACEMENT PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION D901 0DR210009AC DIODE,RECTIFIER BAV21 TP D902 0DR210009AC DIODE,RECTIFIER BAV21 TP IC01 0ICTMPH005A IC,TDA9381PS/N2/3,L8011-24A PHILI D903 0DR210009AC DIODE,RECTIFIER BAV21 TP...
  • Page 31 The components identified by mark For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film critical for safety. digit in the P/No. means as CE : Electrolytic RN : Metal Film Replace only with part number specified.
  • Page 32 CONNECTOR C815 0CK4710W515 470PF 500V K B TR C816 0CN1030F679 10000P 16V M Y TA52 P01A 366-921B CONNECTOR,2.5MM 3P GIL-G LG CABLE . C817 0CK4710W515 470PF 500V K B TR P301 366-043K CONNECTOR,PLUG(4P) C818 0CE107BH618 100UF KME 25V M FL TP5...
  • Page 33 The components identified by mark For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film critical for safety. digit in the P/No. means as CE : Electrolytic RN : Metal Film Replace only with part number specified.
  • Page 34 7.5 OHM 1/2 W 5.00% TA52 TH801 163-054F THERMISTOR,PTC J502P84D140M290Q R816 0RD2001F609 2K OHM 1/6 W 5.00% TA52 TU101 6700VPF009V TUNER,TAFL-G579D LG MULTI FS W/S 38. R901 0RD2200F609 220 OHM 1/6 W 5.00% TA52 “ 6700VPF009S TUNER,TAEL-G672D R902 0RD2200F609 220 OHM 1/6 W 5.00% TA52...
  • Page 35 P/NO:3854VA0083A-S 2001.04.20...
  • Page 36 PRINTED CIRCUIT BOARD WIRING DIAGRAM COMPONENT LOCATION GUIDE MAIN & CPT C01..B4 C403 ..G4 C607..B3 C811 ..G3 F812 ..E2 L801 ..E4 R05..B4 R218 ..D5 R554 ..D4 R820..F4 C02..B4 C404 ..G4 C611..B3 C812..E2 F801A ..G2 L802 ..E3 R06..B3 R219 ..D5 R555 ..D4 R822..F4 C03..B3 C405 ..G4...
  • Page 37: Svc. Sheet

    SVC. SHEET : 3854V A0083A-S SVC. SHE...